As far as I see, the run is completely valid following the current emulation rules, so there's no need to worry about that :D That resource was added just for the sake of keeping things updated, since some people are already using this emulator and it's known to be more precise than Fusion or another ones.

More updates to the rules will come in the future following the 2019 rule set.

Yup, as Raikou said, Mania in-game leaderboards are up to Sega or whoever is in charge there, not here. Your only hope is that they get cleaned by the time Mania Plus is released.

"The following unofficial emulators are allowed: Regen, Kega Fusion and Genesis Plus GX. Links to these are in resources."

Fusion is not banned. Read carefully :D

You need to move a bit to the left if you're doing spin dashes on top of the right pillar to avoid that, but that's not an issue if you land hits from the left one.